Module: Capistrano::DataPlaneApi::TerminalPrintLoop

Defined in:
lib/capistrano/data_plane_api/terminal_print_loop.rb

Overview

Provides a method that renders strings in a terminal with the given interval.

Class Method Summary collapse

Class Method Details

.call(interval: 2, &_block) ⇒ Object

Calls the passed block in an endless loop with a given interval between calls. It prints the String returned from the block and clears it before another frame is printed.

Signature:

  • (?interval: Integer) { (String) -> Object } -> void

Parameters:

  • interval: (defaults to: 2) —

    Number of seconds between each screen refresh



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# File 'lib/capistrano/data_plane_api/terminal_print_loop.rb', line 19

def call(interval: 2, &_block)
  previous_line_count = 0
  previous_max_line_length = 0
  loop do
    content = ::String.new
    yielded = yield(content)

    print ::TTY::Cursor.clear_lines(previous_line_count + 1)

    content = yielded if yielded.is_a?(::String) && content.empty?
    line_count = 0
    max_line_length = 0
    content.each_line do |line|
      line_count += 1
      max_line_length = line.length if line.length > max_line_length
    end
    previous_line_count = line_count
    previous_max_line_length = max_line_length

    puts(content)
    sleep(interval)
  end
end